SvcHost

SvcHost keeps a node process alive with restarts

• Small and very lightweight
• Avoid dictating the restart logic or params. Extensible logic for restart conditions, grow, etc...
• Purpose built - avoid coupling with other problems like runnng as a service or file watching (see sister project SvcInstall for installing as a daemon)
• Package host with your app or service

Install:

npm install svchost --save

Sample:

See ./samples for more

var sh = require('../lib/svchost');
var path = require('path');

var host = new sh.SvcHost();
host.on('start', function(pid, starts){
    console.log('started (' + pid + ') - ' + starts + ' starts');
});

host.on('restart', function(){
    console.log('restart.');
});		

host.on('exit', function(code, reason){
    console.log('exit (' + code + ') : ' + reason);
});	

host.on('abort', function(){
    console.log('abort after restarts');
});

host.on('stdout', function(data){
    process.stdout.write(formatOutput('out', data));
});

host.on('stderr', function(data){
    process.stdout.write(formatOutput('err', data));
});

//
// api consumer can control restarts, sleeps, grow etc...
// this example allows 5 starts with a wait of a second per restart in between
//
var maxStarts = 3;
var RESTART_DELAY = 1000;  // 1 sec

var handleRestart = function(starts, relaunch) {
    console.log(starts, 'starts');
    if (starts < maxStarts) {
        console.log('waiting to restart');
        setTimeout(function(){
                relaunch(true);
            }, 
            RESTART_DELAY*starts);			
    } 
    else {
        console.log('fail');
        relaunch(false);
    }
}

host.start(path.join(__dirname, 'badserver.js'),           // absolute path (better for running as service)
            [],                        // args 
            handleRestart);  

License

Apache 2.0